What sits at the center of the atom?
What sits at the center of the atom?

An atom has a tiny central nucleus and electrons outside it. The nucleus is extremely small compared with the whole atom, but it contains almost all of the atom's mass.
Step-by-step lessons on CIE IGCSE Physics 5.1.2a Composition of the nucleus and isotopes. Each one builds up to exam-style questions. Build a strong foundation in mechanics and electricity before tackling the more mathematically demanding astrophysics and nuclear topics.